--- /dev/null
+/*
+ * Copyright (C) 2015 Linaro
+ *
+ * Author: Jun Nie <jun.nie@linaro.org>
+ *
+ * License terms: GNU General Public License (GPL) version 2
+ */
+
+#include <linux/clk.h>
+#include <linux/device.h>
+#include <linux/dmaengine.h>
+#include <linux/init.h>
+#include <linux/io.h>
+#include <linux/kernel.h>
+#include <linux/module.h>
+#include <linux/of_address.h>
+#include <sound/asoundef.h>
+#include <sound/core.h>
+#include <sound/dmaengine_pcm.h>
+#include <sound/initval.h>
+#include <sound/pcm.h>
+#include <sound/pcm_params.h>
+#include <sound/soc.h>
+#include <sound/soc-dai.h>
+
+#define ZX_CTRL 0x04
+#define ZX_FIFOCTRL 0x08
+#define ZX_INT_STATUS 0x10
+#define ZX_INT_MASK 0x14
+#define ZX_DATA 0x18
+#define ZX_VALID_BIT 0x1c
+#define ZX_CH_STA_1 0x20
+#define ZX_CH_STA_2 0x24
+#define ZX_CH_STA_3 0x28
+#define ZX_CH_STA_4 0x2c
+#define ZX_CH_STA_5 0x30
+#define ZX_CH_STA_6 0x34
+
+#define ZX_CTRL_MODA_16 (0 << 6)
+#define ZX_CTRL_MODA_18 BIT(6)
+#define ZX_CTRL_MODA_20 (2 << 6)
+#define ZX_CTRL_MODA_24 (3 << 6)
+#define ZX_CTRL_MODA_MASK (3 << 6)
+
+#define ZX_CTRL_ENB BIT(4)
+#define ZX_CTRL_DNB (0 << 4)
+#define ZX_CTRL_ENB_MASK BIT(4)
+
+#define ZX_CTRL_TX_OPEN BIT(0)
+#define ZX_CTRL_TX_CLOSE (0 << 0)
+#define ZX_CTRL_TX_MASK BIT(0)
+
+#define ZX_CTRL_OPEN (ZX_CTRL_TX_OPEN | ZX_CTRL_ENB)
+#define ZX_CTRL_CLOSE (ZX_CTRL_TX_CLOSE | ZX_CTRL_DNB)
+
+#define ZX_CTRL_DOUBLE_TRACK (0 << 8)
+#define ZX_CTRL_LEFT_TRACK BIT(8)
+#define ZX_CTRL_RIGHT_TRACK (2 << 8)
+#define ZX_CTRL_TRACK_MASK (3 << 8)
+
+#define ZX_FIFOCTRL_TXTH_MASK (0x1f << 8)
+#define ZX_FIFOCTRL_TXTH(x) (x << 8)
+#define ZX_FIFOCTRL_TX_DMA_EN BIT(2)
+#define ZX_FIFOCTRL_TX_DMA_DIS (0 << 2)
+#define ZX_FIFOCTRL_TX_DMA_EN_MASK BIT(2)
+#define ZX_FIFOCTRL_TX_FIFO_RST BIT(0)
+#define ZX_FIFOCTRL_TX_FIFO_RST_MASK BIT(0)
+
+#define ZX_VALID_DOUBLE_TRACK (0 << 0)
+#define ZX_VALID_LEFT_TRACK BIT(1)
+#define ZX_VALID_RIGHT_TRACK (2 << 0)
+#define ZX_VALID_TRACK_MASK (3 << 0)
+
+#define ZX_SPDIF_CLK_RAT (4 * 32)
+
+struct zx_spdif_info {
+ struct snd_dmaengine_dai_dma_data dma_data;
+ struct clk *dai_clk;
+ void __iomem *reg_base;
+ resource_size_t mapbase;
+};
+
+static int zx_spdif_dai_probe(struct snd_soc_dai *dai)
+{
+ struct zx_spdif_info *zx_spdif = dev_get_drvdata(dai->dev);
+
+ snd_soc_dai_set_drvdata(dai, zx_spdif);
+ zx_spdif->dma_data.addr = zx_spdif->mapbase + ZX_DATA;
+ zx_spdif->dma_data.maxburst = 8;
+ snd_soc_dai_init_dma_data(dai, &zx_spdif->dma_data, NULL);
+ return 0;
+}
+
+static int zx_spdif_chanstats(void __iomem *base, unsigned int rate)
+{
+ u32 cstas1;
+
+ switch (rate) {
+ case 22050:
+ cstas1 = IEC958_AES3_CON_FS_22050;
+ break;
+ case 24000:
+ cstas1 = IEC958_AES3_CON_FS_24000;
+ break;
+ case 32000:
+ cstas1 = IEC958_AES3_CON_FS_32000;
+ break;
+ case 44100:
+ cstas1 = IEC958_AES3_CON_FS_44100;
+ break;
+ case 48000:
+ cstas1 = IEC958_AES3_CON_FS_48000;
+ break;
+ case 88200:
+ cstas1 = IEC958_AES3_CON_FS_88200;
+ break;
+ case 96000:
+ cstas1 = IEC958_AES3_CON_FS_96000;
+ break;
+ case 176400:
+ cstas1 = IEC958_AES3_CON_FS_176400;
+ break;
+ case 192000:
+ cstas1 = IEC958_AES3_CON_FS_192000;
+ break;
+ default:
+ return -EINVAL;
+ }
+ cstas1 = cstas1 << 24;
+ cstas1 |= IEC958_AES0_CON_NOT_COPYRIGHT;
+
+ writel_relaxed(cstas1, base + ZX_CH_STA_1);
+ return 0;
+}
+
+static int zx_spdif_hw_params(struct snd_pcm_substream *substream,
+ struct snd_pcm_hw_params *params,
+ struct snd_soc_dai *socdai)
+{
+ struct zx_spdif_info *zx_spdif = dev_get_drvdata(socdai->dev);
+ struct zx_spdif_info *spdif = snd_soc_dai_get_drvdata(socdai);
+ struct snd_dmaengine_dai_dma_data *dma_data = &zx_spdif->dma_data;
+ u32 val, ch_num, rate;
+ int ret;
+
+ dma_data = snd_soc_dai_get_dma_data(socdai, substream);
+ dma_data->addr_width = params_width(params) >> 3;
+
+ val = readl_relaxed(zx_spdif->reg_base + ZX_CTRL);
+ val &= ~ZX_CTRL_MODA_MASK;
+ switch (params_format(params)) {
+ case SNDRV_PCM_FORMAT_S16_LE:
+ val |= ZX_CTRL_MODA_16;
+ break;
+
+ case SNDRV_PCM_FORMAT_S18_3LE:
+ val |= ZX_CTRL_MODA_18;
+ break;
+
+ case SNDRV_PCM_FORMAT_S20_3LE:
+ val |= ZX_CTRL_MODA_20;
+ break;
+
+ case SNDRV_PCM_FORMAT_S24_LE:
+ val |= ZX_CTRL_MODA_24;
+ break;
+ default:
+ dev_err(socdai->dev, "Format not support!\n");
+ return -EINVAL;
+ }
+
+ ch_num = params_channels(params);
+ if (ch_num == 2)
+ val |= ZX_CTRL_DOUBLE_TRACK;
+ else
+ val |= ZX_CTRL_LEFT_TRACK;
+ writel_relaxed(val, zx_spdif->reg_base + ZX_CTRL);
+
+ val = readl_relaxed(zx_spdif->reg_base + ZX_VALID_BIT);
+ val &= ~ZX_VALID_TRACK_MASK;
+ if (ch_num == 2)
+ val |= ZX_VALID_DOUBLE_TRACK;
+ else
+ val |= ZX_VALID_RIGHT_TRACK;
+ writel_relaxed(val, zx_spdif->reg_base + ZX_VALID_BIT);
+
+ rate = params_rate(params);
+ ret = zx_spdif_chanstats(zx_spdif->reg_base, rate);
+ if (ret)
+ return ret;
+ ret = clk_set_rate(spdif->dai_clk, rate * ch_num * ZX_SPDIF_CLK_RAT);
+ if (ret)
+ return ret;
+
+ return 0;
+}
+
+static void zx_spdif_cfg_tx(void __iomem *base, int on)
+{
+ u32 val;
+
+ val = readl_relaxed(base + ZX_CTRL);
+ val &= ~(ZX_CTRL_ENB_MASK | ZX_CTRL_TX_MASK);
+ val |= on ? ZX_CTRL_OPEN : ZX_CTRL_CLOSE;
+ writel_relaxed(val, base + ZX_CTRL);
+
+ val = readl_relaxed(base + ZX_FIFOCTRL);
+ val &= ~ZX_FIFOCTRL_TX_DMA_EN_MASK;
+ if (on)
+ val |= ZX_FIFOCTRL_TX_DMA_EN;
+ writel_relaxed(val, base + ZX_FIFOCTRL);
+}
+
+static int zx_spdif_trigger(struct snd_pcm_substream *substream, int cmd,
+ struct snd_soc_dai *dai)
+{
+ u32 val;
+ struct zx_spdif_info *zx_spdif = dev_get_drvdata(dai->dev);
+ int ret = 0;
+
+ switch (cmd) {
+ case SNDRV_PCM_TRIGGER_START:
+ val = readl_relaxed(zx_spdif->reg_base + ZX_FIFOCTRL);
+ val |= ZX_FIFOCTRL_TX_FIFO_RST;
+ writel_relaxed(val, zx_spdif->reg_base + ZX_FIFOCTRL);
+ /* fall thru */
+ case SNDRV_PCM_TRIGGER_RESUME:
+ case SNDRV_PCM_TRIGGER_PAUSE_RELEASE:
+ zx_spdif_cfg_tx(zx_spdif->reg_base, true);
+ break;
+
+ case SNDRV_PCM_TRIGGER_STOP:
+ case SNDRV_PCM_TRIGGER_SUSPEND:
+ case SNDRV_PCM_TRIGGER_PAUSE_PUSH:
+ zx_spdif_cfg_tx(zx_spdif->reg_base, false);
+ break;
+
+ default:
+ ret = -EINVAL;
+ break;
+ }
+
+ return ret;
+}
+
+static int zx_spdif_startup(struct snd_pcm_substream *substream,
+ struct snd_soc_dai *dai)
+{
+ struct zx_spdif_info *zx_spdif = dev_get_drvdata(dai->dev);
+
+ return clk_prepare_enable(zx_spdif->dai_clk);
+}
+
+static void zx_spdif_shutdown(struct snd_pcm_substream *substream,
+ struct snd_soc_dai *dai)
+{
+ struct zx_spdif_info *zx_spdif = dev_get_drvdata(dai->dev);
+
+ clk_disable_unprepare(zx_spdif->dai_clk);
+}
+
+#define ZX_RATES \
+ (SNDRV_PCM_RATE_22050 | SNDRV_PCM_RATE_32000 | SNDRV_PCM_RATE_44100 | \
+ SNDRV_PCM_RATE_48000 | SNDRV_PCM_RATE_88200 | SNDRV_PCM_RATE_96000 |\
+ SNDRV_PCM_RATE_176400 | SNDRV_PCM_RATE_192000)
+
+#define ZX_FORMAT \
+ (SNDRV_PCM_FMTBIT_S16_LE | SNDRV_PCM_FMTBIT_S18_3LE \
+ | SNDRV_PCM_FMTBIT_S20_3LE | SNDRV_PCM_FMTBIT_S24_LE)
+
+static struct snd_soc_dai_ops zx_spdif_dai_ops = {
+ .trigger = zx_spdif_trigger,
+ .startup = zx_spdif_startup,
+ .shutdown = zx_spdif_shutdown,
+ .hw_params = zx_spdif_hw_params,
+};
+
+static struct snd_soc_dai_driver zx_spdif_dai = {
+ .name = "spdif",
+ .id = 0,
+ .probe = zx_spdif_dai_probe,
+ .playback = {
+ .channels_min = 1,
+ .channels_max = 2,
+ .rates = ZX_RATES,
+ .formats = ZX_FORMAT,
+ },
+ .ops = &zx_spdif_dai_ops,
+};
+
+static const struct snd_soc_component_driver zx_spdif_component = {
+ .name = "spdif",
+};
+
+static void zx_spdif_dev_init(void __iomem *base)
+{
+ u32 val;
+
+ writel_relaxed(0, base + ZX_CTRL);
+ writel_relaxed(0, base + ZX_INT_MASK);
+ writel_relaxed(0xf, base + ZX_INT_STATUS);
+ writel_relaxed(0x1, base + ZX_FIFOCTRL);
+
+ val = readl_relaxed(base + ZX_FIFOCTRL);
+ val &= ~(ZX_FIFOCTRL_TXTH_MASK | ZX_FIFOCTRL_TX_FIFO_RST_MASK);
+ val |= ZX_FIFOCTRL_TXTH(8);
+ writel_relaxed(val, base + ZX_FIFOCTRL);
+}
+
+static int zx_spdif_probe(struct platform_device *pdev)
+{
+ struct resource *res;
+ struct zx_spdif_info *zx_spdif;
+ int ret;
+
+ zx_spdif = devm_kzalloc(sizeof(*zx_spdif), GFP_KERNEL);
+ if (!zx_spdif)
+ return -ENOMEM;
+
+ zx_spdif->dai_clk = devm_clk_get(&pdev->dev, "tx");
+ if (IS_ERR(zx_spdif->dai_clk)) {
+ dev_err(&pdev->dev, "Fail to get clk\n");
+ return PTR_ERR(zx_spdif->dai_clk);
+ }
+
+ res = platform_get_resource(pdev, IORESOURCE_MEM, 0);
+ zx_spdif->mapbase = res->start;
+ zx_spdif->reg_base = devm_ioremap_resource(&pdev->dev, res);
+ if (!zx_spdif->reg_base) {
+ dev_err(&pdev->dev, "ioremap failed!\n");
+ return -EIO;
+ }
+
+ zx_spdif_dev_init(zx_spdif->reg_base);
+ platform_set_drvdata(pdev, zx_spdif);
+
+ ret = devm_snd_soc_register_component(&pdev->dev, &zx_spdif_component,
+ &zx_spdif_dai, 1);
+ if (ret) {
+ dev_err(&pdev->dev, "Register DAI failed: %d\n", ret);
+ return ret;
+ }
+
+ ret = devm_snd_dmaengine_pcm_register(&pdev->dev, NULL, 0);
+ if (ret)
+ dev_err(&pdev->dev, "Register platform PCM failed: %d\n", ret);
+
+ return ret;
+}
+
+static const struct of_device_id zx_spdif_dt_ids[] = {
+ { .compatible = "zte,zx296702-spdif", },
+ {}
+};
+MODULE_DEVICE_TABLE(of, zx_spdif_dt_ids);
+
+static struct platform_driver spdif_driver = {
+ .probe = zx_spdif_probe,
+ .driver = {
+ .name = "zx-spdif",
+ .owner = THIS_MODULE,
+ .of_match_table = zx_spdif_dt_ids,
+ },
+};
+
+module_platform_driver(spdif_driver);
+
+MODULE_AUTHOR("Jun Nie <jun.nie@linaro.org>");
+MODULE_DESCRIPTION("ZTE SPDIF SoC DAI");
+MODULE_LICENSE("GPL");
projects / GitHub / exynos8895 / android_kernel_samsung_universal8895.git / commitdiff